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G. GABE, F. LUBBERGER, G. FRUBING AND H. B. RTTER.

SEMI-AUTOMATVIC TELEPHONE SYSTEM.

APPLICATION mso 1111111.19. 1914. RENEWED @01.18.1919.

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UNITED STATES rirriniT oEEIoE- GEORGGRABE, or NIKoLAs SEE, NEAR BERLIN, ERITz LUEBERGER, or HALENSEE, ,NEAR BERLIN, AND GEORGERBING, oE oHARLoTT'ENBURG, NEARBERLIN, GERMANY, AND HENDRICH EERTUS RTTER, oF AMSTERDAM, NETHERLANDS, AssIGNoRs To SIEMENS a HALSKE, A. G., 0E BERLIN, GERMANY, A CORPORATION 0F GERMANY.

Specification of Letters Patent.

Application led March 19, 1914, Serial No. 825,937. Renewed October v18, 1919. Serial No. 331,747.

To all 'whom t may concern.'

Be it known that We, GEORG GRABE, a citizen of the German Empire, Fnrrz L UB- BERGER, a citizen of. the German Empire, GEORG FRBING, a citizen of the German Empire, and'HENDR-Ioii 4BERTUS RTTER, a citizen of the Kingdom of Holland, and respectively residing at Nikolas See, near Berlin, Germany, Halensee, near `Berlin, Germany, Charlottenburg, near Berlin,`Ger many, and AI'nsterdam, Netherlands, have invented certain new and useful Improvements in Semi-Automatic Telephone Systems, of .which the following is a specification.

' This invention relates to .apparatus for .supervising the exchange positions in semiautomatic telephone systems.1

In semi-automatic telephone systems z'. e; in systems in which operators are empioyed for receivin the calls and adjusting the selectors, it is very important to supervise the single exchange position in-order to assure'proper reception of the calls and proper operation of the keys or` the like provided at the positions. The supervision of. thel exchange posit'ons 4by special supervision officials, as is possible -in manual operation,

cannot in this case produce the desired result, because the adjustment of the keys' at the exchange positions takes place, very rapidly and after the adjustmentof the selectors the k s are at once ad]ust ed aresh. In addition it is preferable to perforin the' supervision secretly in order that the time when the control is exercised may not be= noticed-at the position under observation. The listening control Well'known in manuall operated central stations does not in itselgsuiiice for'semi-automatic AWorking as the succession of impulses-takesplace toorapidly.

An important object of our invention 1s to provide separate from the ,exchange p ositions an observation station Whichl admits of the possibility of vlistening to the desired number informed by a calling 'telephone station to an observing exchange position,

I and at the same time the testing of thesubsequent adjustment for communicating the currentimpulsesiwhich is 'effected by the exchange position under observation. To this end, suitable means are providedat the observation position for Arendering Visible the adjustment of the key board of the exchange position at the observation position or recording the current impulses emitted at the exchange position.

The constant recording of a selector adjustment, which is once brought about, is of great importance for semi-automatic operation, because'it admits of subsequent testing of the adjustment of the keys affected by an operator, and also aiords a valuable and reliable record ofthe supervising otticial with regard to the operator Which can be rendered still more valuable by recording by suitable means e. g. a Poulsen appar ratus, also the talk between theoperator and the calling subscriber. In automaticr working this arrangement is also important vWhich are worked with the Working stations, arebrought under the influence of the place of observation by the oiiicial at the place holding or locking the said apparatus by suitable manipulations'in the nor mal connection of the system When-.he perceives or suspects errors, in order to-be able to make the requisite determinations with `greater certainty and in order to detect a defective apparatus or an operator who is not paying Suiiicient attention. To this end,

w'e provide a device for locking the connection to the operators position in question or to the impulse sender in question for furthercalls when a fault is perceived, in order that additional subscribers.v calls are not endangered.

The invention 1s represented by'way of example diagrammatically' in the accom-` panying drawing, showing means by which in addition to the manipulations of the opel'-r ator being controlled, e. g, preselectors, service selectors, group Selectors, connectors, im-

pulse senders ,and the. like, which are Workedv with the exchange position, are .brop., :1;ht

Patented Dec. 2, 1919.

Vlll' and n service selector DW to :in eX-` cnange position. The inquiriT line. fzis used fit tbc .sume time :is s lino for trzmsmittmg i tbe current impulses from the exebange posl tion over tbc service selector DW to the group selector GV? und farther. The obser ration position is equipped Wit/bn switch bl, to wliicli branch lines lend 'from the line a.. lben throwing the switch t5, which lisis four arms, nto circuit et un eicbzuige posiH tion s receiver at the observation position is switched into circuit, orerwhich tbe calls arriving at exchange position can be heard. lbe switch S is common to u number ot cscbenge positions, oi which onlj.Y one shown. ln order to test tbe correctness of tbe current impulses issued by tbe exchange position, there is connected in series with the receiver u. device, comprising magnet which attracts ts armature :il ezicli current impulseundtliereby producesI u character on u movable baud, which muy be fed continuousl)v7 or intermitently sitter euch arriving cell at s speed sucbthat u snilicient space is obtained between the individual records of tbe impulses in order to render tbem clearly perceptible. *y

llllien tbe observation position connected into circuit tbe relay Hit energized over tbe key l und renders uit the Contact in tbe circuit1 for the relug.' Tl independent Oli tbe impiilse sender mid tbe-)roby prevents tbe disconnection 'tire service selector und impulseVV sender. The Contact l-is opened only temporarily by the impulse sender shortlj1 before tbe termination otl tbe inipulses, und tlie Contact H is closed during tbe impulses closes tbe circuit for tbe relay T2, so tint the. con iection with tbe. calling subscriber interrupted. "ill desi@ nates the impulse Contact et tbe. .f4.brsncli and; IV tbe grounding Contact et the' b branch. 'observing oiiicial will depress tbe key 2, to energize tlierelsgzf-U Wbicb. holds itself and cen be released only by tbe its? Tu. The fre-vlsy U conne-cts into ci; sist t-'ne loclnno4 and therebyv orevents wronazg keys being ser. id. ne eifmssnin impulses is sterfbed the eoAi ec's'l,

t Wrong impulses are emitted tbe which ioelis tbe key-board lessees or" tbe relay T1 can be released und switchesA ,the service selector in known manner into its rest position, or the keyboard is released, if it is e service selector which remains in the position obtained on the establishmerrtofnthe connection. 1

lt will be obvious, that although only one embodiment or' the invention is sbowmmsny' modifications muy be made Without departing from the spirit ot' the invention, for instance for tbe Morse apparatus recording,r tbe impulses may be substituted :my suitable means known 1n this nrt for rendering the occurrences perceptible to tbe observing station. v

l. ln u scniieiutonnitictelephone sysbern one or more observation stations, ineens at ,sid observation. stations for supervising the tell; between the operator at the exchange position and the calling subscriber, and means :it said observation stations for superrising tbe impulse despatch by tbe operetor of' tbe exclmnge o'llicc without his knowledge. i

2.111 n semi-automatic telephone system one or more observation stations, means et seid observation stations for supervising tbc tells between tbe operator et tbe; exchange position and tbe culling subscriber, means :it smid ol :-:nrmtion stations for connectingelectrically seid supervising ineens to the talking circuit o?? sur one of tbc exchange positions, means at Suid observation stations for recording;` tbe current impulses going Afrom su); one of the exchange positions to tbe selectors, and means for connecting the lilloise. apparatus to any one of seid impulse lines.

3. ln a semi-automatic system one or more observation stations, means et said observation stations for supevising the talk between tbe operator ut tbeexcbsnge position and tbe cullingsubscribcr, means at said observation ,tions for connecting electrically said supervising ineens to the talking circuit, means et seid observation positions for supervising tbeimpulse despatch ut tbe cxoilice uf'itliout the knowledge of the eter, and switching devices at scid ob- 'servation stations by means of Wiicb the tus w'cb are in operative relation Willi the are brought under the influence of the observing station for the purpose of any manipulations or determinations which may become necessary.

4. In a semi-automatic telephone system one or more observation stations, a telephone apparatus at said observation stations, means at said observation stations for supeivising` the impulse despatch by the operator 4at the exchange position and switching devices under the influence of the observing station for connecting at will the telephone to the calling line or the supervising means to the impulse line for the purpose of sending and controlling feigned calls.

5, In a senil-automatic telephone system one or more observation stations, means at said observation stations for supervising the `talk between the operator at the exchange position and the calling subscriber, means at said observation stations for supervising the impulse despatch by the operator of the exchange position Without his knowledge and means at the observation station for blocking the line to the exchangeposition against further calls for the purpose of preventin an upsetting of the investigation and o1' further calls of subscribers by the faulty working of the apparatus.

6. In a semi-automatic telephone system -one 'or more observation stations7 means at 30 said observation stations for supervising the talk between the operator at the exchange position and the callingsubscriber, means at said observation stations for supervising the impulse despatch by the operator of the ex- 35 change position without hisknowledge and means such as a change over switchl at theobservation stat-ion, which normally after finishing the despatch of impulses is separated from the established connection for 40 the establishment and maintenance of a listening circuit in order to overhearl the conversation between the calling and called subscriber after the emission of impulses. In testimony whereof we have set our 45 names in the' presence oftivo witnesses.

(1)` GEORGGRABE. .(2) FRITZ LUBBERGER. (3) GEoRG FRUBING. (4) .HENnRicH-BBRTUS BUTTER. Witnesses as t0 signatures Nos. 1-3.

WOLDEMAR HAUPT, HENRY HAsPnn. Witnesses as to signature No. 4.

P. HILDERING, C. KEITH 

